Improvement in combined circular and elliptical cutters



we DEEDS ANU L1 P BHADWAY COMBINED @11pm/1L@ GIHGULAR GUTTER Milli llllllll .b1 A I UNITED STATES PATENT OFFICE.

WILLIAM S. DEEDS, OF BALTIMORE, MARYLAND, AND JOHN P. BRADWAY, OF PHILADELPHIA, PENNSYLVANIA.

IMPRVEMENI IN COMBINED CIRCULAR ANDVELLIPTICAL CUTTERS.

Specification forming part of Letters Patent No. 117,611, dated August 1, 1871.

To all whom it may concern:

Beit known that we, WILLIAM S. DEEDs, of the city of Baltimore and State of Maryland, and JOHN P. BRADWAY, of the city of .Philadelphia and State of Pennsylvania, have invented a Oombined Elliptical and (lircul ar Cutter, of which the following is a speciication:

The primary object of our machine is thecutting of tin plates in elliptical and circular forms. It will answer, however, to cut photograph-cards, or other articles. The nature of the invention 4consists of a machine provided with a trammelcross and clamp-holder, in combination with ordinary circular cutters, the said clamp -holder having an oscillatory and reciprocal movement in the operation of cutting ellipses, and the said cross and clamp-holder being stationary during the cutting of circles, as hereinafter described.

To enable others skilled in the art to which our improvement appertains to make and use our improved machine, we will now give a full description thereof. v

In the accompanying drawing which makes a part of this specification, Figure l is a plan of the improved machine. Fig. 2 is/a side elevation, partly in section, at the line was of Fig. 1. Fig. 3 is a side elevation of the lower portion of the frame A. Fig. 4L is a top view of the same. Fig. 5 is a top view of the adjustable standard F. Figs. 6 and 7 are end and top views of the swivelslide. Figs. S and 9 are top and edge views of the adjustable guide Gr.

Like letters in all the gures indicate the same parts.

A is the frame, to which the several parts of the machine are connected. B B are revolving cutter-shafts. O C are circular cutters on one end of the same. D D are gear-wheels on the other ends of the shafts, which connect them together. E is a trammel-cross. F is an adjustable standard on which it revolves. G is an adjustable guide connected with the bed-plate .of the frame A. H is the clamp-holder. J J are revolving clamps with disks, whose stems a a turn freely in their bearings inthe holder H, the lower stem a' having connection with the trammel E. The

stand F, with which the trammel-cross E is connected by means of the revolving guides K K, has anges b b that fit the grooves l d of the frameA to admit ofthe longitudinal adjustment of thel stand, the latter being provided with a set-screw, e, that has play in the longitudinal slot j' in one side of the frame A; The yarm y of the standard F has a vertical slot, h, seen in Fig. 5, which admits 'of the adjustment of the trammelguide. The guide G, shown in detail in Figs. 8 and 9, has iianges b b', that iit in the grooves d d, above described, ofthe bed-plate A, to admit of the longitudinal adjustment of the guide, the same being provided with a set-screw, e', which has play in the longitudinal slot f. Ve do not confine ourselves to fastening the standard E and A guide G by means of the set-screws e e' and sl ot f, as they may be fastened in any convenient manner. The clamp-holder H is provided with an adjustable slide, L, which moves freely on the guide G in the reciprocating movement of the holder, the said slide being provided with a frictionroller, M, that rolls in the longitudinal vertical slot j of the guide, seen in Figs. 8 and 9, in the oscillatory movement of the holder H. The studpin k, which carries said roller, has a head, Z, that slides in the longitudinal grooves m m at the bottom of the slot, whereby the slide is held in connection with thel guide. The clamping-disk J is elevated a short distance above the clampingdisk J by means of the spring N, connected with the clamp-holder H and the stem of the disk, as seen in Fig. 2, to admit of the placing of the sheet of tin to be cut between the clamps. The sheet is fastened by means of the screw 0 which bears upon the end of the stems a of the disk J.

The operation of the machine is as follows: The standardFis so adjusted as to have its center in a vertical line equal in distance from the revolving cutters C C to one-half of the conjugate diameter of the ellipses to be cut. The center of the guide K is set as far from the center of the guide K as the difference between one-half of the transverse and conjugate diameters ofthe ellipsis to be cut. The stem a of the clamp J is confined in the boss a ofthe trammel-cross E by means of the pin 0,' so as to cause the trammel to be carried around with the clamps to give the reciprocating movements of the/tin to and from the cutters O The tin or other article to be cut is then placed in position between the clamping-disks J J and the cutters C C revolved by means of 'the crank P on one of the gear-wheels D, and the action ofthe cutters upon the tin revolves the same and the trammel-cross E and gives the proper reciprocating movement to the clamp-holder H for the cutting of the ellipsis. Q is a gauge connected with the clamp-holder H for the transverse diameter ofthe ellipsis. There is a scale on the frame A to guide in the adjustment of the standard F. A similar scale is on the edge of the arm g of the standard, which is used for the adjustment ofthe guide K'. By detaching the pin o from its connection with the trammel-cross E and the stein a! of the clampingdisk J', so as to prevent the turning of the cross, the machine may be used for cutting circles of various sizes by the proper adjustment of the standard E.

Heretofore, it has not been found practical to cut circles With elliptical cutters in consequence of the clamp-holder havin g to revolve; but, as in our arrangement the clamp-holder does not revolve, but merely gives Way to the motion ofthe trammel-cross, the prevention of the motion of the latter, as above described, admits of the holder remaining stationary When circles are to be cut.

[n s.] JOHN P. BRADWAY.

Witnesses:

STEPHEN UsTIcK, THOMAS J BEWLEY. 

